Move Nix files back to the root of the project

hosts/common/default.nix

@@ -0,0 +1,135 @@
+{
+  headless,
+  hostname,
+  inputs,
+  outputs,
+  pkgs,
+  self,
+  stateVersion,
+  system,
+  username,
+  ...
+}:
+
+{
+  imports = [
+    inputs.home-manager.nixosModules.home-manager
+
+    outputs.nixosModules.default
+
+    ./programs.nix
+  ];
+
+  nix = {
+    settings = {
+      auto-optimise-store = true;
+
+      download-buffer-size = "104857600";
+
+      experimental-features = [
+        "nix-command"
+        "flakes"
+      ];
+
+      warn-dirty = false;
+    };
+  };
+
+  users.defaultUserShell = pkgs.zsh;
+
+  environment.systemPackages =
+    with pkgs;
+    [
+      cryptsetup
+      fastfetch
+      mermaid-cli
+      mkcert
+      passmenu-otp
+
+      (pass.withExtensions (
+        e: with e; [
+          passExtensions.pass-audit
+          passExtensions.pass-import
+          passExtensions.pass-otp
+          passExtensions.pass-update
+        ]
+      ))
+    ]
+    ++ pkgs.lib.optionals (!headless) [
+      acpi
+      arandr
+      brightnessctl
+      cpufrequtils
+      libnotify
+      pmutils
+      ffmpegthumbnailer
+      hunspellDicts.en-gb-large
+      libreoffice
+      shotwell
+      vscode
+    ];
+
+  home-manager = {
+    extraSpecialArgs = {
+      inherit
+        hostname
+        inputs
+        outputs
+        headless
+        self
+        system
+        username
+        ;
+    };
+    useGlobalPkgs = true;
+    useUserPackages = true;
+
+    users."${username}" = import "${self}/home/${username}";
+  };
+
+  nixpkgs = {
+    config = {
+      allowUnfree = true;
+
+      permittedInsecurePackages = [ "electron-27.3.11" ];
+    };
+
+    overlays = [
+      inputs.nur.overlays.default
+
+      outputs.overlays.additions
+      outputs.overlays.modifications
+      outputs.overlays.stable-packages
+    ];
+  };
+
+  nix.extraOptions = ''
+    trusted-users = root ${username}
+  '';
+
+  networking.hostName = hostname;
+
+  time.timeZone = "Europe/London";
+
+  i18n = {
+    defaultLocale = "en_GB.UTF-8";
+
+    extraLocaleSettings = {
+      LC_ADDRESS = "en_GB.UTF-8";
+      LC_IDENTIFICATION = "en_GB.UTF-8";
+      LC_MEASUREMENT = "en_GB.UTF-8";
+      LC_MONETARY = "en_GB.UTF-8";
+      LC_NAME = "en_GB.UTF-8";
+      LC_NUMERIC = "en_GB.UTF-8";
+      LC_PAPER = "en_GB.UTF-8";
+      LC_TELEPHONE = "en_GB.UTF-8";
+      LC_TIME = "en_GB.UTF-8";
+    };
+  };
+
+  console.keyMap = "uk";
+
+  security.sudo.wheelNeedsPassword = false;
+
+  system.stateVersion = stateVersion;
+}

hosts/common/programs.nix

@@ -0,0 +1,16 @@
+{ pkgs, ... }:
+
+{
+  programs = {
+    gnupg.agent = {
+      enable = true;
+      enableSSHSupport = true;
+      pinentryPackage = pkgs.pinentry-qt;
+    };
+
+    zsh = {
+      enable = true;
+      histSize = 5000;
+    };
+  };
+}

hosts/common/users.nix

@@ -0,0 +1,4 @@
+{ pkgs, username, ... }:
+
+{
+}